Ruff, John
Current rating: 1552
Record: 5-2
| Grand Prix Washington DC 1999 (UDS limited) | starting rating: 1500 | |||
| round | table | opponent (rating) | result | Δrating |
| 1sealed | 82 | Linder, Isaac (1500) | Won 0-0 | +181518 |
| 2sealed | 3 | Smith, Josh (1500) | Lost 0-0 | -181500 |
| 3sealed | 111 | Egli, Walter (1482) | Lost 0-0 | -191481 |
| 4sealed | 165 | Burns, Mike (1464) | Won 0-0 | +181499 |
| 5sealed | 123 | Kiernan, Jason (1465) | Won 0-0 | +171516 |
| 6sealed | 97 | Harmon, Max (1518) | Won 0-0 | +181534 |
| 7sealed | 59 | Chen, Bin (1501) | Won 0-0 | +181552 |
| average opponent: 1490record: 5-2 | new rating: 1552 | |||